On Saturday, 420 more women than men attended a concert. On Sunday, the number of women decreased by 40% and the number of men increased by 70%. 804 audience attended the concert on Sunday. If each ticket cost $20, how much money was collected from the sale of concert tickets for the two days?

	Women		Men
Comparing between the women and the men at first	420 more
Before	5x2	+ 420	10x1
Change	- 2x2	- 168	+ 7x1
After	3x2	+ 252	17x1

	Women		Men
Before	10 u + 420		10 u
Change	- 4 u - 168		+ 7 u
After	6 u + 252		17 u

40% = ⁴⁰₁₀₀ = ²₅

70% = ⁷⁰₁₀₀ = ⁷₁₀

40% x 420
= ⁴⁰₁₀₀ x 420
= 168

420 - 168 = 252

Total number of tickets sold on Sunday 
= 6 u + 252 + 17 u
= 23 u + 252 

23 u + 252 = 804
23 u = 804 - 252
23 u = 552

1 u = 552 ÷ 23 = 24

Total number of tickets sold for the two days
= (10 u + 420) + 10 u + (6 u + 252) + 17 u
= 43 u + 672
= 43 x 24 + 672
= 1704

Amount collected from the sale of concert tickets for the two days
= 1704 x 20
= $34080

Answer(s): $34080